Chen Zhao-Fu, Huang Hua, Chang An-Bi, Xu Zhou, He Hu, Lei Lu-Rong, Hu Jin-Guang, Yuan Huan, Liu Zhen-Bang. Investigation and suppression of pulse shortening problem caused by non-working mode self-excitation in an S-band long pulse relativistic klystron amplifierJ. Acta Physica Sinica, 2014, 63(23): 238402. DOI: 10.7498/aps.63.238402